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The curse of intelligence
Quick, a bat and ball cost a dollar and ten cents. The bat costs a dollar more than the ball. How much does the ball cost?
Post your answer in comments ... and then read this great +The New Yorker piece.
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Why five cents? Oh, read the article. Still don't see the reasoning.
+Karras Bommer, Because the total is 1.10 for the bat to be a dollar more it would have to cost 1.05 leaving 5 cents for the ball. Most people would assume 10 cents, but that would make the Bat 1 dollar and only 90 cents more than the ball.
Try thinking of it in pennies. You have 110 of them and you need the bat to cost 100 cents more than the ball. If you say the Ball is 10 that leaves 100 cents for the bat 100 - 10 = 90. However if the ball is 5 cents that leaves 105 cents for the bat or 105 - 5 = 100. 

Hope that helps, its a tricky one for sure.
x + (x+ 1) = 1.1
2x + 1 = 1.1
2x = .1
x = .05
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